Chiral

Something which is chiral is not symmetric about it's own center. It's mirror image is asymmetric. The example often used to demonstrate this concept is one's own hand: Rotating one's own hand 180° does not return it to the original shape. The thumb and the pinky trade places and the front is distinct from the back.

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  One's own hand before rotation (Thumb on left, pinky on right).

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  One's own hand after rotation (Thumb on right, pinky on left).

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  The system of both hands is symmetric despite the individual chirality.

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